The Padres and Dodgers agreed to a trade last week that would send Kemp, catcher Tim Federowicz and $32 million to San Diego for catcher Yasmani Grandal and pitching prospects Joe Wieland and Zach Eflin.
However, after Kemp's physical Tuesday, Padres' physicians are now discussing whether the arthritis would impact his career.
If the Padres choose to void the trade, then it would impact the Dodgers' trade with the Phillies for shortstop Jimmy Rollins since the deal included Eflin.
While the USA Today report has surfaced, Kemp's agent -- Junior Spivey -- told FOX Sports reporter Ken Rosenthal, "Everything is OK. We're just waiting on the final details. Should be good to go." Although, Spivey added he has not heard from the Padres since Kemp took his physical Tuesday.
Machado had right knee surgery in August and Wieters underwent Tommy John surgery in June.
"With both of these guys, it will be when and not if. I think if you held a gun up to my head, I think Manny makes the start of the year, and I think Matt is very close thereafter, but we won’t put either one of these guys on the field until it’s time to go, and try to keep the finish line in mind," Showalter said.
The Hiroshima Carp of the Japan Central League informed ace pitcher Kenta Maeda on Thursday he will not be posted this offseason, according to The Japan Times. Maeda, who has expressed his desire to pitch in the majors, will not be a free agent until after the 2017 season.
The right-handed hurler has won 10-plus games for Hiroshima the last five seasons. In his seven-year career, he is 82-59 with a 2.44 ERA and 1.05 WHIP. He is also striking out 7.3 batters and walking 1.9 batters per nine innings.
"He's in a spot where he if continues progressing at the rate he has, then I would expect that he's in a good position to make our club and get at-bats," general manager Jon Daniels said. "It's not going to be handed to him, but he has a strong chance to earn that spot."
The 24-year-old Rua hit .295 with two home runs, seven doubles and 14 RBI in 28 games with the Rangers in 2014. He had a .285/.365/.489/.854 slash line in 382 minor-league games before his promotion to the majors.
"He's not a guy that was off the radar screen and only produced for a month," Daniels said. "He's always hit from Day 1, and is an extremely hard worker that I think is going to have a good big league career."
"We talked to (Dr.) Steve Wray after the surgery and he said it really went well," Braves president of baseball operations John Hart said. "He said [the procedure] really went well, and he thinks that this guy will be ready to go full go in spring training. The only thing is that there will be a little bit of a disruption for his normal routine getting ready for spring training."
Markakis is expected to be cleared for physical activities within the next month, and the hope is he will be fully cleared within six weeks. Markakis agreed to a four-year, $44 million deal with the Braves in early December.
The 32-year-old Aoki hit .285/.349/.360 over 491 at-bats last year. With the Royals signing Alex Rios earlier in the week, Aoki will likely have to move on with a different club.
De Leon was designated for assignment by the club last week, and the team couldn't find a way to deal him. De Leon appeared in eight games last season, posting a 4.91 ERA over 7 1/3 innings.
If the Matt Kemp and Wil Myers trades go through, the team would have a surplus in the outfield. On top of those two players, San Diego would also have Carlos Quentin, Will Venable, Cameron Maybin and Smith. The 32-year-old Smith hit .266/.367/.440 over 443 at-bats last year.